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introduction： Ideal gas: An idealized gas often used as a working medium。It fits the equation of statepv=RT 。On a micro level﹐It assumes that the molecules of the ideal gas are elastomers﹐Ignoring the intermolecular forces and the volume occupied by the molecules themselves is a natural conclusion﹐Therefore, it has the most concise relationship between the physical structure model and the thermal state parameters。The actual gas is more or less deviated from the ideal gas﹐But the temperature is usually higher﹑Low pressure gas(Like air in the atmosphere﹑Boiler flue gas﹑Gas in internal combustion engines and gas turbines
2015-02-09 Reading quantity 2842
introduction：Residual stress value（kg/mm2)post-carburizing880-900Degree salt bath heating，260Degree isotherm40minutes-65 post-carburizing880-900Degree-salt bath heating quenching，260Degree isotherm90minutes-18 post-carburizing880-900Degree salt bath heating，260Degree isotherm40minutes，260Degree tempering90minutes-38 Slave table1The test results show that the surface residual compressive stress of isothermal quenching is higher than that of normal quenching low temperature tempering process。Even low temperature tempering after isothermal quenching,Its surface residual compressive stress，It is also higher than low temperature tempering after quenching。Thus it can be concluded that
2015-02-08 Reading quantity 1512
introduction： A drive that continuously and stepless changes the transmission ratio of the input shaft to the output shaft or the speed of the output shaft。On working principle﹐Stepless transmission can be divided into mechanical﹑Fluid power﹑Hydraulic pressure﹑Air pressure and electricity。 Mechanical stepless speed change Usually by a transmission mechanism﹑Pressure device and speed regulating mechanism3Partial composition(figure1 The basic type of mechanical stepless transmission )。Most of them use friction drive to achieve speed change。figure2 Cone and disc continuously variable transmission It is a tape-and-disc continuously variable transmission﹐It rests between the belt and the cone disc
2015-02-08 Reading quantity 2837
introduction：Shaft workpieces in the process of turning，Will encounter the accuracy and surface roughness can not meet the requirements and other problems。According to the specific process of turning，Conduct analysis。 one、The reasons and solutions of dimensional accuracy not reaching the requirements 1.Due to operator carelessness，An error in child testing，Or the dial is wrong and used incorrectly so that when measuring，Be careful，It is very important to use the dial correctly，In the case of the middle pallet handle dial，The dials of all types of lathes are different，Each small dial can be calculated by the following formula：Turn the dial one square
2015-02-08 Reading quantity 1579
introduction：HiwinHow to measure and calculate linear guide rail，How to fix it，Lets talk about it in detail。
2015-02-08 Reading quantity 8513
introduction： bearing[bearing:bearing（“Bearing”，Japanese person“Axial receptor”）It is a part that holds and reduces the friction coefficient of load during mechanical transmission。Can also be said，When other parts move relative to each other on the shaft，A device used to reduce the coefficient of friction during power transmission and to keep the center of the shaft fixed。]noise：There is a slight running noise when the new bearing is running，This noise is expressed in decibels。The cause of noise of rolling bearing is more complicated。 The main reason is： （1）Due in bearing、The outer ring surface is uneven。Generate bearing noise。 （2）On account of
2015-02-08 Reading quantity 1621
introduction：Laminar injection molding is a kind of molding process with the characteristics of co-extrusion and injection molding，The process can arbitrarily produce very thin layered states in complex parts。Layer injection molding performs two different resin injections at the same time，Each melt is layered step by step in a multistage co-extruded die head，The thickness of each layer becomes thinner and the number of layers increases，Finally enter the injection mold cavity superposition，Retain the layered form obtained through the above process，That is, the two types of trees do not exist in a disordered blending state along the thickness direction of the product，Its compounded and superimposed。By report，Layer injection molding each layer thickness is0.1－10pm。layer
2015-02-08 Reading quantity 2862
introduction：Calculation of fatigue life Following bearing[bearing:bearing（“Bearing”，Japanese person“Axial receptor”）It is a part that holds and reduces the friction coefficient of load during mechanical transmission。Can also be said，When other parts move relative to each other on the shaft，A device used to reduce the coefficient of friction during power transmission and to keep the center of the shaft fixed。]The calculation method of fatigue life is based on the national standardGB6391-96《Rolling bearing——-Calculation method of rated dynamic load and rated life》And national standardsISO281/I-1997《Rolling bearing——Rated dynamic load and rating
2015-02-08 Reading quantity 1595
introduction： Measurement of cylindricity error in length measurement techniques。cylindricity(See form and position tolerance)It is a synthesis of the roundness of a cylinder and the straightness of a prime line﹐Therefore, cylindricity is generally attached to the roundness meter that can move axially along the measured cylinder﹑To be measured by electronic computers and corresponding programs。Measuring time﹐The probe of the length sensor measures several cross sections of the measured cylinder along a precision linear guide﹐Spiral motion sampling along the measured cylinder can also be performed。The cylindricity error is determined by the computer according to the minimum conditions。Coordinate measurement with electronic computer and corresponding program
2015-02-08 Reading quantity 2852
introduction：bearing[bearing:bearing（“Bearing”，Japanese person“Axial receptor”）It is a part that holds and reduces the friction coefficient of load during mechanical transmission。Can also be said，When other parts move relative to each other on the shaft，A device used to reduce the coefficient of friction during power transmission and to keep the center of the shaft fixed。]Should be cleaned with gasoline or kerosene before installation，Use after drying，And ensure good lubrication，Bearings are generally lubricated with grease，Oil lubrication can also be used。When using grease lubrication，No impurities should be selected、antioxidant、rust-proof、Excellent performance greases such as extreme pressure。Grease filling amount for bearing and
2015-02-08 Reading quantity 1517
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